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Abstract

Disclosed is a mechanism that translates the hot roll temperature sensing apparatus contained within the fuser of an electrophotographic printer.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
100% of the total text.

Multiple Track Hot Roll Temperature Measurement

Disclosed is
a mechanism that translates the hot roll
temperature sensing apparatus contained within the fuser of an
electrophotographic printer.

Electrophotographic printers that utilize hot-roll-type fusers
often detect the hot roll's surface temperature using a
spring-biased, sliding-contact thermistor.
The thermistor is housed
within an elastomer pad, separated from the hot roll surface
by a
thin layer of TEFLON* tape. The tape is
necessarily thin to allow
quick response by the thermistor to
changes in hot roll
temperature. Continuous pressure by the
thermistor on a
TEFLON-coated hot roll can scratch the surface of the hot roll
leading to print quality defects and premature failure.

A solenoid used to initiate separation of the
hot roll from
the back-up roll during POR or jam
clearing (see the figure) was
further utilized to generate multiple thermistor to hot roll contact
tracks. A cable attached to the back-up
roll's mounting hardware
increments a reversing lead screw. The
thermistor bracket is
attached to the
lead screw follower.

Distributing the wear across a
larger area reduces the
likelihood of hot
roll scratches and
premature fuser failure.
* Trademark of E. I. du Pont de Nemours
& Co.